Rotary pump screw torsion detection equipment

Abstract

The utility model discloses rotary pump screw torsion detection equipment, and relates to the technical field of torsion detection equipment. The device comprises a base, a detection assembly, a support, a rotation driving assembly and a detected piece. Wherein the detection assembly is arranged on the base; the support is detachably assembled on the base; the support is located above the detection assembly; the rotary driving assembly is assembled on the support; the output end of the rotary driving assembly faces the detection end of the detection assembly; one end of a detected piece is inserted into the detection end of the detection assembly, and the other end of the detected piece is inserted into the output end of the rotation driving assembly. The detection end of the detection assembly, the output end of the rotation driving assembly and the detected piece are coaxial. The output end of the rotation driving assembly drives one end of the detected piece to rotate, and the detection assembly detects the other end of the detected piece. With the adoption of the technical scheme, the device has the advantages of simplicity and convenience in operation, accuracy in measurement and detection and capability of avoiding personal errors.

Description

Technical Field

[0001] This utility model relates to the technical field of torque testing equipment, specifically to a rotary pump screw torque testing device. Background Technology

[0002] Because the rotary pump's rotating shaft and seals require an interference fit to achieve a tight seal, excessive interference can increase the load on the pump's drive unit. Conversely, insufficient interference can lead to seal failure, causing unstable dispensing volume during adhesive application and impacting the final product's production. Therefore, it is necessary to measure the torque data of the screw rotating after the shaft seal is installed.

[0003] Existing torque testing devices only have a torque testing base, which requires placing the object to be tested on the base and rotating it manually. Since it is impossible to ensure that the pump body and the testing base remain perpendicular during manual rotation, and the speed and force of rotation cannot be controlled, the measured data fluctuates greatly. Furthermore, due to individual differences among testing personnel, the data measured by different personnel also varies greatly, making it impossible to accurately and effectively measure the true torque data between the rotating shaft and the shaft seal of the screw rotary pump. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a rotary pump screw torque testing device, which has the advantages of simple operation, accurate measurement, precise detection, and the ability to avoid human error.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a rotary pump screw torque testing device, comprising:

[0006] Base;

[0007] The detection component is mounted on the base;

[0008] A support is detachably mounted on the base; the support is located above the detection assembly;

[0009] A rotary drive assembly is mounted on the support; the output end of the rotary drive assembly faces the detection end of the detection assembly; and

[0010] The test piece is inserted at one end into the detection end of the detection assembly and at the other end into the output end of the rotary drive assembly.

[0011] The detection end of the detection component, the output end of the rotation drive component, and the workpiece under test are coaxial;

[0012] The output of the rotation drive assembly drives one end of the test piece to rotate, while the detection assembly detects the other end of the test piece.

[0013] The present invention further includes the following: the detection component includes a sensor disposed on the base and a mounting base inserted on the detection end of the sensor; the mounting base has a first insertion groove at one end facing the test piece for inserting one end of the test piece.

[0014] The present invention further includes: a test housing with an internal cavity, a test rod with one end placed in the cavity and the other end passing through the test housing and inserted into the first insertion groove, and a sealing member placed in the cavity and located between the test housing and the test rod.

[0015] The present invention further includes, wherein the rotary drive assembly comprises: a drive device mounted on the support and having its output shaft facing the mounting base, and a rotating component having one end fixedly sleeved on the output shaft and the other end having a second insertion groove for one end of the housing to be tested to be inserted.

[0016] The present invention further includes a positioning member in the second insertion groove, the free end of which extends vertically toward the direction of the rod being tested; and a slot that mates with the positioning member is provided at one end of the housing being tested that is inserted into the second insertion groove.

[0017] The present invention further comprises, wherein the base includes:

[0018] Base plate;

[0019] A first extension seat; one end of the first extension seat is disposed on the base plate, and the other end extends perpendicularly toward the support; and

[0020] Second extension seat; one end of the second extension seat is disposed on the base plate, and the other end extends vertically toward the support;

[0021] The first extension seat and the second extension seat are located on both sides of the mounting base, respectively.

[0022] The present invention further includes a first positioning pin and a second positioning pin respectively provided on the side of the first extension seat and the second extension seat facing the support; the side of the support facing the first extension seat and the second extension seat respectively is provided with a first positioning hole and a second positioning hole that cooperate with the first positioning pin and the second positioning pin; the first positioning pin, the second positioning pin, the first positioning hole, the second positioning hole and the rod being measured are located on the same vertical plane.

[0023] The present invention further provides that the first extension seat and the second extension seat are respectively provided with a third positioning pin and a fourth positioning pin that cooperate with the first positioning hole and the second positioning hole on the side facing the support and the side facing away from the mounting base.

[0024] The present invention further comprises that the first extension seat and the second extension seat are respectively provided with a first magnetic attractor and a second magnetic attractor on the side that abuts against the support; the support is respectively provided with a third magnetic attractor that cooperates with the first magnetic attractor and a fourth magnetic attractor that cooperates with the second magnetic attractor on the side that abuts against the first extension seat and the second extension seat.

[0025] The present invention further includes, in addition to, a gear switch disposed on the support and electrically connected to the drive device; the gear switch is used to switch the working state of the drive device.

[0026] The beneficial effects of this utility model after adopting the above technical solution are as follows: In this utility model, the output end of the rotary drive component drives one end of the test piece to rotate, providing a certain rotational speed to that end of the test piece. Manual rotation is not required, ensuring accurate measurement and avoiding human error. The detection end of the detection component, the output end of the rotary drive component, and the test piece are coaxial, ensuring that the axis of the test piece, the axis of the detection end of the detection component, and the axis of the output end of the rotary drive component are on the same vertical line, guaranteeing accurate detection. During detection, simply insert one end of the test piece into the detection end of the detection component and the other end into the output end of the rotary drive component, assemble the support on the base, and turn on the rotary drive component. The operation is simple, convenient, and quick. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 This is a partial cross-sectional schematic diagram of the present invention;

[0030] Figure 3 It corresponds Figure 2 A magnified view of part A;

[0031] Figure 4This is a structural schematic diagram from another perspective of the present invention;

[0032] Figure 5 It corresponds Figure 4 A schematic diagram showing the structure where the support is separated from the first extension seat and the second extension seat;

[0033] Figure 6 This is a structural schematic diagram from another perspective of this utility model;

[0034] Figure 7 This is a structural diagram showing the first positioning hole and the third positioning pin, and the second positioning hole and the fourth positioning pin in their mating state.

[0035] Explanation of reference numerals in the attached drawings: 100, base; 110, base plate; 120, first extension seat; 130, second extension seat; 200, detection assembly; 210, sensor; 220, mounting base; 221, first insertion slot; 300, support; 400, rotation drive assembly; 410, drive device; 411, output shaft; 420, rotating component; 421, second insertion slot; 430, positioning component; 500, test piece; 510, test housing; 511, insertion point. 512, Cavity; 520, Measured Rod; 530, Seal; 610, First Positioning Pin; 620, Second Positioning Pin; 630, First Positioning Hole; 640, Second Positioning Hole; 650, Third Positioning Pin; 660, Fourth Positioning Pin; 710, First Magnetic Attachment; 720, Second Magnetic Attachment; 730, Third Magnetic Attachment; 740, Fourth Magnetic Attachment; 750, Fifth Magnetic Attachment; 760, Sixth Magnetic Attachment; 810, Gear Switch; 820, Speed ​​Adjustment Knob. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings.

[0037] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0038] This embodiment relates to a rotary pump screw torque detection device, referring to... Figures 1-4The system includes: a base 100, a detection component 200, a support 300, a rotary drive component 400, and a test piece 500. The detection component 200 is mounted on the base 100; the support 300 is detachably mounted on the base 100 and is located above the detection component 200; the rotary drive component 400 is mounted on the support 300; the output end of the rotary drive component 400 faces the detection end of the detection component 200; one end of the test piece 500 is inserted into the detection end of the detection component 200, and the other end is inserted into the output end of the rotary drive component 400; the detection end of the detection component 200, the output end of the rotary drive component 400, and the test piece 500 are coaxial; the output end of the rotary drive component 400 drives one end of the test piece 500 to rotate, and the detection component 200 detects the other end of the test piece 500. Specifically, the output end of the rotary drive assembly 400 drives one end of the measured component 500 to rotate, providing a certain rotational speed to that end of the measured component 500. This eliminates the need for manual rotation, ensuring accurate measurement, avoiding human error, and saving time and effort. The detection end of the detection assembly 200, the output end of the rotary drive assembly 400, and the measured component 500 are coaxial, ensuring that the axis of the measured component 500, the axis of the detection end of the detection assembly 200, and the axis of the output end of the rotary drive assembly 400 are on the same vertical line (see reference). Figure 2 and Figure 3 The vertical axis B) ensures accurate detection. During detection, simply insert one end of the test piece 500 into the detection end of the detection component 200 and the other end into the output end of the rotary drive component 400, assemble the support 300 onto the base 100, and turn on the rotary drive component 400. The operation is simple, convenient, and quick.

[0039] Further, the detection component 200 includes: a sensor 210 and a mounting base 220; the sensor 210 is disposed on the base 100; the mounting base 220 is inserted into the detection end of the sensor 210; the mounting base 220 has a first insertion groove 221 at one end facing the test piece 500 for one end of the test piece 500 to be inserted. Specifically, the sensor 210 is disposed on the base plate 110, and the sensor 210 is configured as a torque sensor 210. The torque sensor 210 is externally connected to a torque display device, which can intuitively read the data. In some embodiments, the sensor 210 may also be other sensors capable of detecting torque.

[0040] Furthermore, referring to Figures 2-3The test piece 500 includes a test housing 510, a test rod 520, and a seal 530. The test housing 510 has a cavity 512; one end of the test rod 520 is placed inside the cavity 512, and the other end passes through the test housing 510 and is inserted into a first insertion slot 221; the seal 530 is placed inside the cavity 512 and located between the test housing 510 and the test rod 520. Specifically, the rotation drive assembly 400 drives the test housing 510 to rotate relative to the test rod 520. A seal 530 is provided between the test housing 510 and the test rod 520, and one end of the test rod 520 is inserted into the first insertion slot 221 on the mounting base 220, which is inserted into the detection end of the sensor 210. When the tested housing 510 rotates, a torque is applied to the tested rod 520 through the seal 530. One end of the tested rod 520 is inserted into the first insertion groove 221 of the mounting base 220, and the tested rod 520 transmits the torque to the mounting base 220. The detection end of the sensor 210 detects the torque data of the mounting base 220, that is, it detects the torque data of the tested rod 520. In this embodiment, the seal 530 is set as a sealing ring sleeved on the outer periphery of the tested rod 520. In some embodiments, the seal can also be a colloid, and this solution can also be used to detect the torque data when there is colloid in the cavity 512. In this embodiment, the tested component 500 is a screw rotary pump, and the tested rod 520 is a screw.

[0041] Furthermore, referring to Figure 5 The rotary drive assembly 400 includes a drive unit 410 and a rotating component 420. The drive unit 410 is mounted on a support 300; the output shaft 411 of the drive unit 410 faces the mounting base 220; one end of the rotating component 420 is fixedly sleeved on the output shaft 411, and the other end has a second insertion slot 421 for inserting one end of the housing 510 to be tested. The rotating component 420 facilitates the connection between the housing 510 to be tested and the output shaft 411 of the drive unit 410, ensuring that the housing 510 to be tested and the output shaft 411 of the drive unit 410 rotate coaxially. Specifically, the second insertion slot 421 is crisscross-shaped, allowing the housing 510 to be installed every 90° of rotation, improving installation and alignment efficiency and making it easier for operators to use. Furthermore, a positioning member 430 with its free end extending vertically toward the probe 520 is provided in the second insertion groove 421; the end of the housing 510 to be inserted into the second insertion groove 421 has a slot 511 that mates with the positioning member 430. Inserting the positioning member 430 into the slot 511 ensures the coaxiality of the probe 520, the rotating member 420, and the output shaft 411 of the drive device 410, and the coaxiality of the probe 520, the mounting base 220, and the sensor 210, further guaranteeing the accuracy of the measurement. In this embodiment, the drive device 410 is a motor. In some embodiments, the drive device 410 may also be a motor or a hand-cranked drive wheel.

[0042] Reference Figures 5-6 The base 100 includes a base plate 110, a first extension seat 120, and a second extension seat 130. One end of the first extension seat 120 is mounted on the base plate 110, and the other end extends vertically toward the support 300. One end of the second extension seat 130 is mounted on the base plate 110, and the other end extends vertically toward the support 300. The first extension seat 120 and the second extension seat 130 are located on opposite sides of the mounting base 220. The arrangement of the first extension seat 120 and the second extension seat 130 ensures sufficient vertical space between the rotating component 420 and the mounting base 220 for placing the test component 500. Furthermore, the first extension seat 120 and the second extension seat 130 are respectively provided with a first positioning pin 610 and a second positioning pin 620 on the side facing the support 300; the support 300 is respectively provided with a first positioning hole 630 and a second positioning hole 640 that mate with the first positioning pin 610 and the second positioning pin 620 on the side facing the first extension seat 120 and the second extension seat 130; the first positioning pin 610, the second positioning pin 620, the first positioning hole 630, the second positioning hole 640, and the measured rod 520 are located on the same vertical plane. The support 300 is assembled with the first extension seat 120 and the second extension seat 130 through a quick-release connection of positioning pins and positioning holes, which facilitates the installation and removal of the measured part 500. The cooperation between the first positioning pin 610, the second positioning pin 620 and the first positioning hole 630 and the second positioning hole 640 can ensure the accuracy of the assembly of the support 300 with the first extension seat 120 and the second extension seat 130, thereby ensuring the accurate position of the output shaft 411 and the rotating part 420 of the drive device 410 relative to the mounting base 220, and avoiding measurement errors caused by the assembly of the support 300 with the first extension seat 120 and the second extension seat 130. The first positioning pin 610, the second positioning pin 620, the first positioning hole 630, the second positioning hole 640, and the measured rod 520 are located on the same vertical plane. Since the output end of the rotary drive assembly 400, the detection end of the detection assembly 200, and the measured part 500 are coaxial, when the first positioning pin 610 is engaged with the first positioning hole 630, and the second positioning pin 620 is engaged with the second positioning hole 640, that is, when the support 300 is assembled with the first extension seat 120 and the second extension, the output end of the rotary drive assembly 400, the measured part 500, and the detection end of the detection assembly 200 can also be automatically aligned, shortening the adjustment time and avoiding measurement errors caused by assembly.

[0043] In some embodiments, refer to Figures 5-7The first extension seat 120 and the second extension seat 130 are respectively provided with a third positioning pin 650 and a fourth positioning pin 660 that cooperate with the first positioning hole 630 and the second positioning hole 640 on the side facing the support 300 and the side facing away from the mounting base 220. The side of the first extension seat 120 and the second extension seat 130 facing the support 300 and the side facing away from the mounting base 220 is set as a placement area. During the disassembly and assembly of the test piece 500, the support 300 is placed on the other side of the first extension seat 120 and the second extension seat 130 so that the third positioning pin 650 and the fourth positioning pin 660 cooperate with the first positioning hole 630 and the second positioning hole 640 to stabilize the support 300 and prevent the support 300 from being lost or accidentally damaged, such as the output shaft 411 and the rotating part 420 of the drive device 410.

[0044] In some embodiments, refer to Figures 5-7 The first extension base 120 and the second extension base 130 are respectively provided with a first magnetic 710 and a second magnetic 720 on the side that abuts against the support 300; the support 300 is respectively provided with a third magnetic 730 that cooperates with the first magnetic 710 and a fourth magnetic 740 that cooperates with the second magnetic 720 on the side that abuts against the first extension base 120 and the second extension base 130. The first magnetic 710, the second magnetic 720, the third magnetic 730 and the fourth magnetic 740 cooperate to ensure that the support 300 abuts tightly against the first extension base 120 and the second extension base 130, ensuring the stability of the installation of the support 300 with the first extension base 120 and the second extension base 130, and further ensuring the stability of the measurement data. In this embodiment, two of each of the following magnetic components are provided: the first magnetic component 710, the second magnetic component 720, the third magnetic component 730, and the fourth magnetic component 740. Two first magnetic components 710 are positioned on either side of the first positioning pin 610, two second magnetic components 720 are positioned on either side of the second positioning pin 620, two third magnetic components 730 are positioned on either side of the first positioning hole 630, and two fourth magnetic components 740 are positioned on either side of the second positioning hole 640. It should be noted that the first magnetic component 710 and the third magnetic component 730 can both be magnets, or one can be made of a magnetic material and the other of a metal material. Similarly, the second magnetic component 720 and the fourth magnetic component 740 can both be magnets, or one can be made of a magnetic material and the other of a metal material.

[0045] In some embodiments, a fifth magnetic 750 and a sixth magnetic 760 are respectively provided on the side of the first extension seat 120 and the second extension seat 130 that abuts against the support 300 and on the side facing away from the mounting base 220. During the assembly and disassembly of the test piece 500, when the support 300 is placed in the placement area, the third magnetic 730 and the fourth magnetic 740 on the support 300 cooperate with the fifth magnetic 750 and the sixth magnetic 760 respectively to stably place the support 300 in the placement area of ​​the first extension seat 120 and the second extension seat 130, preventing the support 300 from being lost. Two fifth magnetic 750s and two sixth magnetic 760s are provided, with the two fifth magnetic 750s respectively positioned on both sides of the third positioning pin 650, and the two sixth magnetic 760s respectively positioned on both sides of the fourth positioning pin 660. Both the third magnetic 730 and the fifth magnetic 750 can be magnets, or one can be made of a magnetic material and the other of a metal material. The fourth magnetic attractor 740 and the sixth magnetic attractor 760 can both be magnets, or one can be made of magnetic material and the other of metal material.

[0046] In some embodiments, refer to Figure 7 The rotary pump screw torque testing device further includes: a position switch 810 disposed on the support 300 and electrically connected to the drive device 410; the position switch 810 is used to switch the working state of the drive device 410. The position switch 810 is configured as a three-position switch, controlling the forward rotation, reverse rotation, and stop of the drive device 410 respectively, so as to adjust the rotation direction of the output shaft 411 of the drive device 410 as needed, thereby changing the rotation direction of the measured part 500. The rotary pump screw torque testing device further includes: a speed adjustment knob 820 disposed on the support 300 and electrically connected to the drive device 410, so as to adjust the speed of the drive device 410 to meet the torque measurement at different speeds. In some embodiments, a power socket is mounted on the bracket.

[0047] The working principle of this utility model is roughly as follows: In this utility model, the axes of the output shaft 411 of the drive device 410, the rotating part 420, the measured rod 520, the mounting base 220, and the sensor 210 are all located on the same vertical line (see reference). Figure 2 as well as Figure 3The vertical axis B avoids detection errors caused by the inability of the measured rod 520 and sensor 210 to maintain perpendicularity, ensuring detection accuracy. Furthermore, this rotary pump screw torque detection device drives the rotating component 420 via the output shaft 411 of the drive device 410, which in turn drives the measured housing 510 to rotate. The measured housing 510 applies a torque to the measured rod 520 through the seal 530. The measured rod 520 transmits this torque to the mounting base 220. The detection end of the sensor 210 detects the torque data received by the mounting base 220, i.e., the torque data received by the measured rod 520. During this process, the drive device 410 can stably drive the measured housing 510 to rotate, applying a smooth, continuous, and uniform torque to the measured rod 520. The measurement data has small fluctuations, stable data output, and saves time and effort. In addition, when testing the torque of the rod 520, simply place one end of the housing 510 to be tested into the second insertion groove 421 and one end of the rod 520 into the first insertion groove 221. Guided by the first positioning pin 610, the second positioning pin 620, the first positioning hole 630 and the second positioning hole 640, the support 300 is assembled on the first extension and the second extension seat 130. Then, the drive device 410 is turned on. The overall operation is simple, convenient and quick, and can also avoid data errors caused by individual differences of operators.

[0048] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A rotary pump screw torque testing device, characterized in that, include: Base (100); A detection component (200) is disposed on the base (100); A support (300) is detachably mounted on the base (100); the support (300) is located above the detection assembly (200); A rotary drive assembly (400) is mounted on the support (300); the output end of the rotary drive assembly (400) faces the detection end of the detection assembly (200); as well as The test piece (500) has one end inserted into the detection end of the detection assembly (200) and the other end inserted into the output end of the rotary drive assembly (400); The detection end of the detection component (200), the output end of the rotation drive component (400), and the test piece (500) are coaxial; The output of the rotary drive assembly (400) drives one end of the test piece (500) to rotate, and the detection assembly (200) detects the other end of the test piece (500).

2. The rotary pump screw torque testing device according to claim 1, characterized in that, The detection assembly (200) includes: a sensor (210) disposed on the base (100) and a mounting base (220) inserted into the detection end of the sensor (210); the mounting base (220) has a first insertion groove (221) at one end facing the test piece (500) for one end of the test piece (500) to be inserted.

3. The rotary pump screw torque testing device according to claim 2, characterized in that, The test piece (500) includes: a test housing (510) having a cavity (512) inside, a test rod (520) having one end placed inside the cavity (512) and the other end passing through the test housing (510) and inserted into the first insertion groove (221), and a sealing member (530) placed inside the cavity (512) and located between the test housing (510) and the test rod (520).

4. The rotary pump screw torque testing device according to claim 3, characterized in that, The rotary drive assembly (400) includes: a drive device (410) mounted on the support (300) with its output shaft (411) facing the mounting base (220), and a rotating component (420) having one end fixedly sleeved on the output shaft (411) and the other end having a second insertion groove (421) for one end of the test housing (510) to be inserted.

5. The rotary pump screw torque testing device according to claim 4, characterized in that, The second insertion groove (421) is provided with a positioning member (430) whose free end extends vertically toward the rod (520) being measured; the end of the housing (510) being measured and inserted into the second insertion groove (421) is provided with a slot (511) that cooperates with the positioning member (430).

6. The rotary pump screw torque testing device according to claim 4, characterized in that, The base (100) includes: Base plate (110); A first extension seat (120); one end of the first extension seat (120) is disposed on the base plate (110), and the other end extends vertically toward the support (300); and Second extension seat (130); one end of the second extension seat (130) is disposed on the base plate (110), and the other end extends vertically toward the support (300); The first extension seat (120) and the second extension seat (130) are located on both sides of the mounting base (220).

7. The rotary pump screw torque testing device according to claim 6, characterized in that, The first extension seat (120) and the second extension seat (130) are respectively provided with a first positioning pin (610) and a second positioning pin (620) on the side facing the support (300); the support (300) is respectively provided with a first positioning hole (630) and a second positioning hole (640) that cooperate with the first positioning pin (610) and the second positioning pin (620) on the side facing the first extension seat (120) and the second extension seat (130); the first positioning pin (610), the second positioning pin (620), the first positioning hole (630), the second positioning hole (640) and the rod to be measured (520) are located on the same vertical plane.

8. The rotary pump screw torque testing device according to claim 7, characterized in that, The first extension seat (120) and the second extension seat (130) are respectively provided with a third positioning pin (650) and a fourth positioning pin (660) that cooperate with the first positioning hole (630) and the second positioning hole (640).

9. The rotary pump screw torque testing device according to claim 8, characterized in that, The first extension seat (120) and the second extension seat (130) are respectively provided with a first magnetic member (710) and a second magnetic member (720) on the side that abuts against the support (300); the support (300) is respectively provided with a third magnetic member (730) that cooperates with the first magnetic member (710) and a fourth magnetic member (740) that cooperates with the second magnetic member (720) on the side that abuts against the first extension seat (120) and the second extension seat (130).

10. The rotary pump screw torque testing device according to claim 9, characterized in that, The rotary pump screw torque detection device further includes: a gear switch (810) disposed on the support (300) and electrically connected to the drive device (410); the gear switch (810) is used to switch the working state of the drive device (410).

Images